LayoutTests/js/script-tests/regexp-flags.js

description('Test RegExp#flags accessor');

debug("property descriptor");
var descriptor = Object.getOwnPropertyDescriptor(RegExp.prototype, 'flags');
shouldBe("descriptor.configurable", "true");
shouldBe("descriptor.enumerable", "false");
shouldBe("typeof descriptor.get", "'function'");
shouldBe("descriptor.set", "undefined");

var flags = descriptor.get;

shouldBe("/a/g.flags", "'g'");
shouldBe("/a/.flags", "''");
shouldBe("/a/gmi.flags", "'gim'"); // order is specified, happens to be alphabetic
shouldBe("new RegExp('a', 'gmi').flags", "'gim'");
shouldBe("flags.call(/a/ig)", "'gi'");

debug("non-object receivers");
shouldThrow("flags.call(undefined)", "'TypeError: The RegExp.prototype.flags getter can only be called on an object'");
shouldThrow("flags.call(null)", "'TypeError: The RegExp.prototype.flags getter can only be called on an object'");
shouldThrow("flags.call(false)", "'TypeError: The RegExp.prototype.flags getter can only be called on an object'");
shouldThrow("flags.call(true)", "'TypeError: The RegExp.prototype.flags getter can only be called on an object'");

debug("non-regex objects");
shouldBe("flags.call({})", "''");
shouldBe("flags.call({global: true, multiline: true, ignoreCase: true})", "'gim'");
shouldBe("flags.call({global: 1, multiline: 0, ignoreCase: 2})", "'gi'");
// inherited properties count
shouldBe("flags.call({ __proto__: { multiline: true } })", "'m'");

debug("unicode flag");
shouldBe("/a/uimg.flags", "'gimu'");
shouldBe("new RegExp('a', 'uimg').flags", "'gimu'");
shouldBe("flags.call({global: true, multiline: true, ignoreCase: true, unicode: true})", "'gimu'");

debug("sticky flag");
shouldBe("/a/yimg.flags", "'gimy'");
shouldBe("new RegExp('a', 'yimg').flags", "'gimy'");
shouldBe("flags.call({global: true, multiline: true, ignoreCase: true, sticky: true})", "'gimy'");